ios - Loading data from api to tableview -


i need load large set of messages backend api tableview ios chat app.each time reload data whole list populated.how more without loading whole list ? load last 20 messages , when user scrolls fetch next 20(last 40 messages) backend. appreciated. thanks

i dont know how go this. imagine call api 

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath

in way call api every time cell on screen. problem approach how ever calling api every time cell goes in , out of screen.


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